Blow-off cock.



i GUSTAVE Hl. GSMAN, OF TOPEKA, KANSAS.

BLOW-.OFF ooox.

'p Specification of Letters Patent.

Patented Oct. 6, 1908.

applicati@ inea october 8, V190e. serial No. 338,028.

My invention relates to blow-oif cocks for,

use on locomotive boilers, and has for its object the rovision of a valve ,orv cock of this class which will afford simple and practical methods of manufacture and produce a device thoroughly strong, and one whose parts conform to shapes re uiring the least expense to Jrinish compatlble with the requirements of this class of cocks. j

My invention is illustrated in the accompanying drawing, in whichf r q Figure 1 is an assembled ysectional elevation of the device. assembled device taken on the line 2-#2 .of Fig. l.

Referringto the drawing, a represents the inclosing shell, which is preferably of brass, and provided with the externallythreaded ortion a which is adapted to threadinto the boiler of a locomotive or other steam engine. This shell is also provided with the inter-` nally threaded portion 0,2 into which the valve seat l) is threaded and with the packing bearing portion a3 into whichthe 1packing tap c threads to make a steam tig t joint about the shaft d. A. This shaft khas the collar d formed thereon against whi'chthe packing e, which` is referablyV of asbestos fiber, presses to hol A dinal movement. VThis shaft has formed upon the inner end the square portion d2 upon which is fitted the inner lever f. This lever f extends into the cavity g within the shellV a and integral therewithare the guide- Fig. 2 is a sectionl of the,v

the shaft d.` against longitup -Witnesses:

, ways a4 and a5 in which the valve g is reci rocatingly mounted. Upon the outer en of the shaft d the operating lever h is secured in any desirable manner, preferably by squaring the end of theshaft and holding the lever hin lace by anut 'i threaded upon the exten ed end of .the shaft d3. It will be seen that by this construction the cock is very readily assembled and requires very little and very simple machine work to produce the finished device from the rough casting.

In operation, the portion a is threaded into the boiler, such that the pressure of steam and water in the boiler seats the valve g. tightly against the valve seat d. In order to o en the valve, it is necessary to apply to the ever h'suflicient force to overcome the pressure of the steam upon the valve plunger, lever f raising such lunger to allow the steam to pass through t e valve.

f The invention herein disclosed is illustrated and described with res ect to details,

though it is not my desire to e unduly lim- Ited thereto, it being understood that many variations from these details may be made without departing from the spirit or scope of my invention.

`having further a side extension adapted to support a transverse shaft, a valve member at lone end of thecasing connected to a valve stem embraced by said guide rings, a shaft in said external support, and an arm projecting from 'the inner end of said shaft and engaging the valve stem, one of said guide rings being split to admit the said armv to the said valve stem.

GUSTAVE H. OSMAN.

JOHN PURCELL, FRANK GAIN. 

